Forums Register Login

New to log4j

+Pie Number of slices to send: Send
I want to add a logging (debug) facility to my Servlets and have come across log4j. It seems simple enough to use, but how does it all work? Is it just case of getting an instance of a Logger object and calling the debug() method? Can I have some sort of simple "-verbose" switch so I can turn the logging on and off (like with the java.exe -verbose option)? I know there is a properties file, but how can I setup it up to do this?

Thanks.
+Pie Number of slices to send: Send
Yes, you get a Logger and then call Logger methods such as debug() or error()

Example basically from Log4j Manual:


A simple way to configure log4j is using a properties (or xml) file. The first time Logger.getLogger() is called log4j looks for either log4j.xml or log4j.properties on the classpath.

The manual also has sample properties files.



Then you said you wanted to turn off debug logging. Log4j uses Levels, if you set a logger's level to WARN, then it will log messages that are at level WARN or more severe (see manual for more or better explanation)

Suppose we are no longer interested in seeing the output of any component belonging to the com.foo package. The following configuration file shows one possible way of achieving this.

log4j.rootLogger=DEBUG, A1
log4j.appender.A1=org.apache.log4j.ConsoleAppender
log4j.appender.A1.layout=org.apache.log4j.PatternLayout

# Print the date in ISO 8601 format
log4j.appender.A1.layout.ConversionPattern=%d [%t] %-5p %c - %m%n

# Print only messages of level WARN or above in the package com.foo.
log4j.logger.com.foo=WARN



If you want a more in-depth manual than what is available at the URL I posted for log4j manual, try The complete log4j manual commercially ($) available in pdf.

[ March 16, 2005: Message edited by: Carol Enderlin ]
[ March 16, 2005: Message edited by: Carol Enderlin ]
Evil is afoot. But this tiny ad is just an ad:
a bit of art, as a gift, that will fit in a stocking
https://gardener-gift.com


reply
reply
This thread has been viewed 1362 times.
Similar Threads
J2EE and Logging
jboss reliability
Log4J Help: Assign differen levels to a logger's appenders
how to retrace an unknown NullPointerException
oc4j, log4j and struts
log4j category
More...

All times above are in ranch (not your local) time.
The current ranch time is
Mar 29, 2024 02:45:26.